Rule.



PATENTED SEPT. 5, 1905.

LIA. WILSON.

RULE APPLICATION FILED HAB.24,1905.

- Qnveml'cz wanna w I suitabi :means for determining the angle of ad ustrent of the head with relation to the UNITED SlAiT ES PATEXT. ()FFICE.

LEWIS A. WYHASUN, ()F :\"()lt'llll*]ASl HARBOR, MAINE.

Maine,

mg is specification.

This invention relates to imprm'ements in T-s uruxe rules of that typeembodying, essentially, :1. rule having an adjustable head with rule.

The invention resides, essentially, in the provision of a device ofnovel construction whereby, the length of the rule may be extended, sothat the same will be equalized for large" or smaller work, according tovarious conditions arising in actual use.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foretiecting the result reference is to be had to the following descriptionand accompanving drawings.

While the invention may be adapted to different forms and conditionsbychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodiment isshown on the accompanying drawings, in which Figure l is a plan view ofa rule embodying the invention, the adjustable section thereof beingextended a shortdistance. Fig. 2 is a transverse sectional view on theline 2 of Fig. 1, showing more clearly the connection between thesections of the rule. Fig. 3 is a broken perspective view, theadjustable rulescctions being shown partly projected from thelmdy-section.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

eferring to the drawings, the letter A designatesthe rule, and theletter B the head thereof, the two forming an ordinary T- square. Therule A is pivotally secured to the head B, a suitable set-screw 1 beingprovided to secure the parts together and admit of adjustment of theparts at a predeter-,

mined angle with relation to each other. The upper side of the head B isprovided with a suitable arc-scale 2, with which a pointer 3, carried bythe adjacent end of the rule A, is

Specification of Letters Patent. Applicatiuu filcdMarch 24,

Patented Sept. 5, 1905. 1905. Serial No, 251,851.

l adapted to cooperate to indicate the angle of adjustment of the ruleto the head.

The rule A consists of a relativelystationary body-scctigm & andadjustable sliding sections 5 at opposite longitudinal edges thereof andpeculiarly attached to the body 4. The secment at the opposite sides ofthe body 4, and I the said sections, as well as the body, are prol videdwith sealeauarks, which may beinches, centimeters, or any other suitablescale measuremen ts, the parts i and 5 having the edge portions inalinement. Thus when the sections 5 by slidable movement are projectedfrom the body 4 said sections will form a continuation of the rulingedges of the body, so that ,l lines of greater length may be made in thel customary manner. I I wardly from the sections 5 at a point he- Itween the ends thereof and forms a finge 1' piece for each section, aswill be readily apparent.

The construction of the body 4 and the sections 5 is peculiar in orderto form an interlocking connection between these parts which will besubstantial and practical. Since each of 5 is mounted in the samemanner,

Projecting rearthe sections only one will be described.

wardly from a longitudinal edge of the section l 5 is a flange 7, theupper side of which is pro- 1 vided with a longitudinal groove 8. This Iflange is received in a recess 9 in a side of the l ruler A, said recessbeing provided longitudi nally thereof with a downwardlycxtending l ribor tongue 10. The tongue 10 is received in the groove 8 of the flange 7,so that the I flange 7 forms an interlocking connection between the bodyof the section 5 and the body l 4 of the ruler. admitting, however, offree slidable moven ent of the section 5, in order I to adjust the sameand increase the length of the ruling device, as above premised. Alongitudinal tongue 11 projects from the rear side of the body of thesection 5, and said tongue operates in a groove or korf 12 in thebody-section 4 of the ruler, the groove 12 aforesaid being located justbeneath the re l cess 9 above described. The outer side of the F body ofeach section 5 slants, so as. to form a l beveled edge for the ruler, aconventional and l desirable construction, as will be found in mostrulers at present in use.

order to facilitate the formation of the intcr- A lug 6 projectsouttions 5 are arranged for longitudinal move'- 1 locking recess, kerfs,and tongues, may be r it made in two parts a and b, said parts a and I)being secured together by screws or finished fastc'nings of-any kind, asmost desirable.

An essential feature of the invention is the provision of the micportions at either side of the part A, the same being divided intoconvenient scales, in order to be useful and very convenient, and havingall the advantages of the scale-rules at present in common use. Further,the device combines the drafting-rule and T-square, andthe draftsmansscale is always before him, saving much time and annoyance in hiswork.

Having thus described the invention, what is claimed as new 'is- A ruleof the type described embodying a bodyvsection provided with a recesslongitudinally of a side thereof, a relatively movable section having alongitudinal flange projected rearwardly therefrom and formed with Momgitudinal groove, said flange being received in the recess of therule-body aforesaid, a longitudinal tongue projecting from a side of therecess in the body-section into the groove of the flange andinterlocking therewith, and a longitudinal tongue projecting rearwardlyfrom the movable section, the body-section having a longitudinal groovebeneath the l'ongitudinal recess before mentioned to receive thelongitudinal tongue of the movablese'etion. 3

In testimony whereof I aflix my signaturein -n presence of twowitnesses.

I LEWIS A. WILSON; In. 8.1]

Witnesses: r

ELLEN S. BERRY, CLARENCE G. STANLEY.

